[jerry moss]

I work in a repair shop (going on 40 years) that does smogs and exhaust and the laws have changed so much in that time, we used to keep a half dozen catalytic converters in stock and could cover 90% of the vehicles on the road, now we don't keep any in stock since there are thousands of part numbers out there. all CARB certified converters have a part number AND an E.O # that must match the engine family/test group number to be legal for installation and when a smog is due the technician has to look up the numbers on a state data base to verify it matches that particular vehicle. and don't forget the state withdraws numbers constantly so if the customer doesn't have a receipt that shows it was installed prior to that number being withdrawn the vehicle fails the smog test and has to buy a new "legal" converter. it is a cluster f*&k.